Gear pump for artificial silk spinning machines



May 19, 1936. Y o. BOCHMANN Er AL 2,041,454

GEAR PUMP FOR ARTIFICIAL SILK SPINNING MACHINES Filed Dec. 15. 1955 Inven ions:

r20 to form a narrowly restricted. chamber.

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Patented May 19, 1936 PATENT OFFICE GEAR PUMP FORARTIFICIAL SILK SPINNING MACHINES Otto Bochmann and Theodor Vollenbroich, Remscheid-Lennep, Germany, assignors to Barmer Maschinenfabrik Aktiengesellschaft, Wuppertal-Oberbarmen, Germany Application December 13, 1933, Serial No. 702,264 In Germany December 20, 1932 artificial silk spinning machines, which pump serves in known manner for continually feeding a uniform quantity of the substance to be spun to the spinning nozzles.

The object of the invention is to provide a connection between the driving shaft and the pump shaft which will prevent the spinning liquid from penetrating from the pump to the driving shaft and end thrusts and stresses from being exerted on the pump shaft resulting in heavy wear and which at the same time enables the pump to be fitted on and removed from the spinning machine as a complete unit.

This is attained acording to the invention in that the driving pump gear is mounted on a shaft terminating in a disc-shaped collar made in one piece with the shaft, this collar being situated in an annular groove in the cover plate, which groove is closed by the support of the pump This arrangement presents the advantage that the pump proper forms a complete aggregate and can be removed without influencing the driving shaft. The result is that the disc-shaped collar can be utilized to form a tight closure and accommodated in a narrowly restricted chamber wthout it being possible for end thrusts or stresses to occur between the driving shaft and the pump shaft.

An embodiment of the invention is illustrated by way of example in the accompanying drawing in which:

Fig. 1 shows the gear pump in longitudinal section.

Fig. 2 is a section on line AB of Fig. 1.

The pump, comprisinga front plate I, a middle plate 2 and a rear plate 3 is connected by screw bolts to a support 4 The gear pump is clamped on the pump bridge so that the inlet passage I5 in the support communicates with the feed conduit for the spinning solution and the outlet passage IS with the delivery conduit to the spinning noz- The driving shaft I3 is joumalled in the support and carries on its outer end a gear, not shown in the drawing, driven by a second gear from the driving shaft of the machine. The spinning solution is fed through the passage I5 of the pump and delivered through the passage I6 to the spinning nozzle in uniform quantities in a certain unit of time. The middle plate accommodates two intermeshing pump gears 5 and B which receive the substance to be spun from Y the inlet passage I5 and deliver it in uniform quantities through the outlet passage I6 to the spinning nozzles. The gear 5 is mounted on a shaft 1 journalled in the front and rear plates I and 3 while the periphery of gear 6 provides the only journal therefor. The shaft l3 has an axial bore I4 with a widened portion of polygonal 5 cross section at its end adjacent the shaft I. A coupling element I2 of polygonal cross-section is engaged in a polygonal bore in'the shaft 1 at one end and in the widened portion of the bore in the shaft I3 at the other end and transmits the 10 rotary movement of the shaft I3 to the shaft 1, thereby driving the gears 5 and 6. To prevent the spinning solution from flowing from the pump to the driving shaft, the front plate I is recessed on its outer side and forms with the surface of 15 the support 4 to which it is bolted a narrowly restricted chamber in which a collar 8 formed on the outer end of the shaft I fits, so that the shaft 1 can rotate freely. A steel'ring 9 countersunk in the support 4 bears lightly against the collar 8 2 which is consequently supported on both its faces I 0 and II and protects the shaft 1 against end thrust and stressing.

Thus the collar 8 fltitng snugly in the narrowly v restricted chamber formed by the plate I and sup- 25 port 4 constitutes a labyrinth packing for preventing the solution from passing to the bearing of the driving shaft I3.

A small quantity of spinning "solution nevertheless leaks past this packing and is guided off through thev bore I4 in the shaft I3 so that it cannot reach the bearing point of this shaft.

We claim:----

1. A gear pump for artificial silk spinning machines, comprising in combination a support having an inlet and an outlet passage for the spinning solution, a casing mounted on said support and composed of an outeriplate, a ring-shaped middle plate and an inner plate provided with 40 inlet and outlet passages registering with the inlet and outlet passages in said support and communicating withthe aperture in said middle plate, two intermeshing gears accommodated in the aperture in said middle plate, a pump shaft carrying one of said gears, a disc-shaped collar formed on the inner end of said pump shaft, said inner plate having an annular groove accommodating said collar free from end thrusts and closed by said support to form a narrow chamber, a driving shaft journalled in said sup- 50 port, and an intermediate coupling element loose- 1y, connecting said driving shaft with said pump shaft.

2. A gear pump for artificial silk spinning machines, comprising in combination a support on the machine frame, a cover plate bearing against said support having an annular groove closed by said support to form a narrowly restricted cham her, a middle plate, a rear plate a driving gear and a driven gear in said middle plate between said cover plate and said rear plate, a shaft extending through said cover plate into said rear plate and carrying said driving gear, a disc shaped collar on the front end of said shaft flttingpnugly in said chamber free from end thrust, a driving shaft having a hollow inner end journalled in said support, and an intermediate element of polygonal cross section connecting said shafts, said driving shaft having-a continuous longitudinal bore extending from its hollow portion to its outer end.

3. A gear pump for artificial silk spinning machines, comprising in combination a support on the machine frame, a cover plate bearing against ber, a middle plate, a rear plate, a driving gearv and a driven gear in said middle plate between said cover plate and said rear plate, a shaft extending through said cover plate into said rear plate and carrying said driving gear, a disc shaped collar on the front end of said shaft fitting snugly in said chamber free from end thrust, a driving shaft having a hollow inner end journalled'in said support, an intermediate element of polygonal cross section connecting said shafts, said driving shaft having a continuous longitudinal bore extending from its hollow portion to its outer end, and a steel ring countersunk in said support opposite said collar forming a running surface for said collar.

O'I'IO BOCHMANN. 'I'HEODOR VOLLENBROICH. 

